package com.sun.service.impl;


import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sun.constant.MessageConstant;
import com.sun.constant.StatusConstant;
import com.sun.dto.SetmealDTO;
import com.sun.dto.SetmealPageQueryDTO;
import com.sun.entity.Artwork;
import com.sun.entity.Setmeal;

import com.sun.entity.SetmealArtwork;
import com.sun.exception.DeletionNotAllowedException;
import com.sun.exception.SetmealEnableFailedException;
import com.sun.mapper.ArtworkMapper;

import com.sun.mapper.SetmealArtworkMapper;
import com.sun.mapper.SetmealMapper;
import com.sun.result.PageResult;
import com.sun.service.SetmealService;
import com.sun.vo.ArtworkItemVO;
import com.sun.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * 套餐业务实现
 */
@Service
@Slf4j
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;

    @Autowired
    private SetmealArtworkMapper setmealArtworkMapper;
    @Autowired
    private ArtworkMapper artworkMapper;

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询艺术品选项
     * @param id
     * @return
     */
    public List<ArtworkItemVO> getArtworkItemById(Long id) {
        return setmealMapper.getArtworkItemBySetmealId(id);
    }

    /**
     * 新增套餐，同时需要保存套餐和艺术品的关联关系
     * @param setmealDTO
     */
    @Transactional
    public void saveWithArtwork(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);

        //向套餐表插入数据
        setmealMapper.insert(setmeal);

        //获取生成的套餐id
        Long setmealId = setmeal.getId();

        List<SetmealArtwork> setmealArtworkes = setmealDTO.getSetmealDishes();
        setmealArtworkes.forEach(setmealArtwork -> {
            setmealArtwork.setSetmealId(setmealId);
        });

        //保存套餐和艺术品的关联关系
        setmealArtworkMapper.insertBatch(setmealArtworkes);
    }

    /**
     * 分页查询
     * @param setmealPageQueryDTO
     * @return
     */
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        int pageNum = setmealPageQueryDTO.getPage();
        int pageSize = setmealPageQueryDTO.getPageSize();

        PageHelper.startPage(pageNum, pageSize);
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除套餐
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        ids.forEach(id -> {
            Setmeal setmeal = setmealMapper.getById(id);
            if(StatusConstant.ENABLE == setmeal.getStatus()){
                //起售中的套餐不能删除
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });

        ids.forEach(setmealId -> {
            //删除套餐表中的数据
            setmealMapper.deleteById(setmealId);
            //删除套餐艺术品关系表中的数据
            setmealArtworkMapper.deleteBySetmealId(setmealId);
        });
    }

    /**
     * 根据id查询套餐和套餐艺术品关系
     *
     * @param id
     * @return
     */
    public SetmealVO getByIdWithArtwork(Long id) {
        Setmeal setmeal = setmealMapper.getById(id);
        List<SetmealArtwork> setmealArtworkes = setmealArtworkMapper.getBySetmealId(id);

        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal, setmealVO);
        setmealVO.setSetmealArtworkes(setmealArtworkes);

        return setmealVO;
    }

    /**
     * 修改套餐
     *
     * @param setmealDTO
     */
    @Transactional
    public void update(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);

        //1、修改套餐表，执行update
        setmealMapper.update(setmeal);

        //套餐id
        Long setmealId = setmealDTO.getId();

        //2、删除套餐和艺术品的关联关系，操作setmeal_artwork表，执行delete
        setmealArtworkMapper.deleteBySetmealId(setmealId);

        List<SetmealArtwork> setmealArtworkes = setmealDTO.getSetmealDishes();
        setmealArtworkes.forEach(setmealArtwork -> {
            setmealArtwork.setSetmealId(setmealId);
        });
        //3、重新插入套餐和艺术品的关联关系，操作setmeal_artwork表，执行insert
        setmealArtworkMapper.insertBatch(setmealArtworkes);
    }

    /**
     * 套餐起售、停售
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        //起售套餐时，判断套餐内是否有停售艺术品，有停售艺术品提示"套餐内包含未启售艺术品，无法启售"
        if(status == StatusConstant.ENABLE){
            //select a.* from artwork a left join setmeal_artwork b on a.id = b.artwork_id where b.setmeal_id = ?
            List<Artwork> artworkList = artworkMapper.getBySetmealId(id);
            if(artworkList != null && artworkList.size() > 0){
                artworkList.forEach(artwork -> {
                    if(StatusConstant.DISABLE == artwork.getStatus()){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }

        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }
}
